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In the dihybrid cross carried out by T.H. Morgan in Drosophila between yellow bodied, white eyed females and brown-bodied, red-eyed males and intercrossing their F1 progeny, it was observed that in F2, the recombinants were only
  • a)
    37.2%
  • b)
    50%
  • c)
    1.3%
  • d)
    62.8%
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
In the dihybrid cross carried out by T.H. Morgan in Drosophila betwee...
Explanation:
In the dihybrid cross carried out by T.H. Morgan in Drosophila, yellow bodied, white-eyed females (yy ww) were crossed with brown-bodied, red-eyed males (YY WW). The two genes being studied here are for body color (B) and eye color (E).

F1 Cross:
The F1 generation produced from this cross would be heterozygous for both traits, i.e., yellow-bodied, red-eyed individuals (Yy Ww).

F2 Cross:
When the F1 generation is intercrossed, four different phenotypes can be observed in the F2 generation.

1. Yellow-bodied, red-eyed individuals (YY WW) - 9/16 or 56.3%
2. Yellow-bodied, white-eyed individuals (YY ww) - 3/16 or 18.8%
3. Brown-bodied, red-eyed individuals (yy WW) - 3/16 or 18.8%
4. Brown-bodied, white-eyed individuals (yy ww) - 1/16 or 6.3%

Recombinants:
Recombinants are the offspring that display a combination of traits different from those of the parental generation. In this case, the recombinants would be the yellow-bodied, white-eyed individuals (YY ww) and brown-bodied, red-eyed individuals (yy WW).

To calculate the percentage of recombinants, you need to add up the frequencies of the two recombinant phenotypes. In this case, the percentage of recombinants is:

Yellow-bodied, white-eyed (YY ww) + Brown-bodied, red-eyed (yy WW) = 18.8% + 18.8% = 37.6%

Therefore, the correct answer is option C) 37.2%.

Conclusion:
In the dihybrid cross carried out by T.H. Morgan in Drosophila, the percentage of recombinants in the F2 generation was 37.2%. This indicates that there was a recombination of the two traits, body color and eye color, during the formation of gametes.
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Community Answer
In the dihybrid cross carried out by T.H. Morgan in Drosophila betwee...
1. Morgan found that the genes for white eye and yellow body were very tightly linked, and present on X-chromosome of Drosophila
2. It showed only 1.3% recombination, and deviated very significantly from the 9 : 3 : 3 : 1 ratio
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In the dihybrid cross carried out by T.H. Morgan in Drosophila between yellow bodied, white eyed females and brown-bodied, red-eyed males and intercrossing their F1 progeny, it was observed that in F2, the recombinants were onlya)37.2%b)50%c)1.3%d)62.8%Correct answer is option 'C'. Can you explain this answer?
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